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On the Positron Localization in Ordered and Disordered Metallic Alloys
Author(s) -
Koenig C.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220880222
Subject(s) - positron , wave function , coherent potential approximation , binary number , condensed matter physics , materials science , function (biology) , alloy , ideal (ethics) , tight binding , physics , atomic physics , quantum mechanics , electronic structure , electron , metallurgy , mathematics , philosophy , arithmetic , epistemology , evolutionary biology , biology
The positron relative affinity for one of the components of a disordered binary metallic alloy is estimated within an ideal solid solution model. The calculation of the probability of finding the positron on each atomic site is reduced to the determination of a pseudo particle density in a tight binding model; these densities are then obtained in the coherent potential approximation (CPA). In the ordered alloy FeAl, the positron wave function is a Bloch wave function, and its relative amplitude on each of the two sublattices gives the positron density on the corresponding metal. The numerical results show that in each case, the inhomogeneities or structural defects must have an important effect on the experimental results.